<template>
  <div class="article-container">
    <!-- 导航栏 -->
    <van-nav-bar
      class="page-nav-bar"
      left-arrow
      title="黑马头条"
      @click-left="onClickLeft"
    ></van-nav-bar>
    <!-- /导航栏 -->

    <div class="main-wrap">
      <!-- 加载中 -->
      <div class="loading-wrap" v-if="loadingType === 'loading'">
        <van-loading color="#3296fa" vertical>加载中</van-loading>
      </div>
      <!-- /加载中 -->

      <!-- 加载完成-文章详情 -->
      <div class="article-detail" v-if="loadingType === 'loadingOK'">
        <!-- 文章标题 -->
        <h1 class="article-title">{{ articleDetail.title }}</h1>
        <!-- /文章标题 -->

        <!-- 用户信息 -->
        <van-cell class="user-info" center :border="false">
          <van-image
            class="avatar"
            slot="icon"
            round
            fit="cover"
            :src="articleDetail.aut_photo"
          />
          <div slot="title" class="user-name">{{ articleDetail.aut_name }}</div>
          <div slot="label" class="publish-date">
            {{ articleDetail.pubdate | dateFormat }}
          </div>
          <FollowedBtn :articleDetail="articleDetail"></FollowedBtn>
        </van-cell>
        <!-- /用户信息 -->

        <!-- 文章内容 -->
        <div
          class="article-content markdown-body"
          v-html="articleDetail.content"
          ref="pageContent"
        ></div>
        <van-divider>正文结束</van-divider>
        <ArticleCommentList
          :articleIdOrCommentId="artID"
          v-model="comCount"
          ref="ArticleCommentList"
        />
      </div>
      <!-- /加载完成-文章详情 -->

      <!-- 加载失败：404 -->
      <div class="error-wrap" v-if="loadingType === 404">
        <van-icon name="failure" />
        <p class="text">该资源不存在或已删除！</p>
      </div>
      <!-- /加载失败：404 -->

      <!-- 加载失败：其它未知错误（例如网络原因或服务端异常） -->
      <div class="error-wrap" v-if="loadingType === false">
        <van-icon name="failure" />
        <p class="text">内容加载失败！</p>
        <van-button class="retry-btn">点击重试</van-button>
      </div>
      <!-- /加载失败：其它未知错误（例如网络原因或服务端异常） -->
    </div>

    <!-- 底部区域 -->
    <div class="article-bottom" v-if="articleDetail.art_id">
      <van-button
        class="comment-btn"
        type="default"
        round
        size="small"
        @click="postShow = true"
        >写评论</van-button
      >
      <van-icon name="comment-o" :badge="comCount" color="#777" />
      <CollectArticle :articleDetail="articleDetail" />
      <ClickLike
        :articleID="articleDetail.art_id"
        v-model="articleDetail.attitude"
      />
      <van-icon name="share" color="#777777"></van-icon>
    </div>
    <!-- 发布评论 弹出层-->
    <van-popup v-model="postShow" position="bottom">
      <CommentPost :artID="artID" @pubComment="pubComment" />
    </van-popup>
    <!-- /发布评论 -->
    <!-- 评论回复 弹出层-->
    <van-popup v-model="isReplyShow" position="bottom" style="height: 100%">
      <CommentReply
        v-if="isReplyShow"
        :articleID="articleDetail.art_id"
        :commentItem="commentItem"
        @click-close="isReplyShow = false"
      ></CommentReply>
    </van-popup>
    <!-- /评论回复 -->
    <!-- /底部区域 -->
  </div>
</template>

<script>
import { getArticleById } from '@/api/article/article.js'
// 导入关注、点赞、收藏组件
import FollowedBtn from '@/components/FollowedBtn.vue'
import CollectArticle from '@/components/CollectArticle.vue'
import ClickLike from '@/components/ClickLike.vue'
// 导入底部评论列表组件
import ArticleCommentList from './comment/CommentList.vue'
// 导入弹出评论组件
import CommentPost from './comment/CommentPost.vue'
// 导入弹出回复评论组件
import CommentReply from './comment/CommentReply.vue'
// 引入图片预览函数
import { ImagePreview } from 'vant'
export default {
  name: 'ArticleIndex',
  data () {
    return {
      loadingType: 'loading', // 加载状态
      articleDetail: {}, // 文章详情
      viewImgs: [], // 图片预览数组
      collectedLoading: false, // 收藏loading
      comCount: 0, // 评论总数
      postShow: false,
      isReplyShow: false,
      commentItem: {}
    }
  },
  props: {
    // 此处artID为路由传参
    artID: { type: [String, Number, Object], required: true }
  },
  components: {
    FollowedBtn,
    CollectArticle,
    ClickLike,
    ArticleCommentList,
    CommentPost,
    CommentReply
  },
  methods: {
    async getArticle () {
      try {
        const { data: res } = await getArticleById(this.artID)
        // const { data: res } = await getArticleById(this.artID)
        this.loadingType = 'loadingOK'
        this.articleDetail = res.data
        this.$nextTick(this.getImagesView)
      } catch (error) {
        if (error.response.status === 404) {
          this.loadingType = 404
        } else {
          this.loadingType = false
        }
      }
    },
    onClickLeft () {
      this.$router.push('/')
    },
    getImagesView () {
      const nodeList = this.$refs.pageContent.querySelectorAll('img')
      nodeList.forEach((img, index) => {
        this.viewImgs.push(img.src)
        img.onclick = () => {
          this.imgClickCallBack(index)
        }
        img.addEventListener('click', () => {
          this.imgClickCallBack(index)
        })
        // img.$on('click') to test
      })
    },
    imgClickCallBack (index) {
      // 图片预览函数
      ImagePreview({
        images: this.viewImgs,
        closeable: true,
        startPosition: index,
        onClose () {
          // this.$toast('Closing')
        }
      })
    },
    // 此方法为发布评论事件触发的回调
    pubComment (newComment) {
      this.$refs.ArticleCommentList.list.unshift(newComment)
      this.comCount++
      this.postShow = false
    }
  },
  computed: {},
  created () {
    this.getArticle() // 获取文章详情数据
    this.$bus.$on('clickReply', (commentItem) => {
      this.commentItem = commentItem
      this.isReplyShow = false
      this.$nextTick(() => {
        this.isReplyShow = true
      })
    })
  }
}
</script>

<style scoped lang="less">
@import "./githup-markdown-css.css";
// @import url('./githup-markdown-css.css');
.article-container {
  //此处将导航栏头部样式放入了公共样式中.page-nav-bar {}
  // /deep/.van-icon {
  //   color: #fff;
  // }
  .main-wrap {
    position: fixed;
    left: 0;
    right: 0;
    top: 92px;
    bottom: 88px;
    overflow-y: scroll;
    background-color: #fff;
  }
  .article-detail {
    .article-title {
      font-size: 40px;
      padding: 50px 32px;
      margin: 0;
      color: #3a3a3a;
    }

    .user-info {
      padding: 0 32px;
      .avatar {
        width: 70px;
        height: 70px;
        margin-right: 17px;
      }
      .van-cell__label {
        margin-top: 0;
      }
      .user-name {
        font-size: 24px;
        color: #3a3a3a;
      }
      .publish-date {
        font-size: 23px;
        color: #b7b7b7;
      }
      .follow-btn {
        width: 170px;
        height: 58px;
      }
    }

    .article-content {
      padding: 55px 32px;
      /deep/ p {
        text-align: justify;
      }
    }
  }

  .loading-wrap {
    padding: 200px 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: #fff;
  }

  .error-wrap {
    padding: 200px 32px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background-color: #fff;
    .van-icon {
      font-size: 122px;
      color: #b4b4b4;
    }
    .text {
      font-size: 30px;
      color: #666666;
      margin: 33px 0 46px;
    }
    .retry-btn {
      width: 280px;
      height: 70px;
      line-height: 70px;
      border: 1px solid #c3c3c3;
      font-size: 30px;
      color: #666666;
    }
  }

  .article-bottom {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    justify-content: space-around;
    align-items: center;
    box-sizing: border-box;
    height: 88px;
    border-top: 1px solid #d8d8d8;
    background-color: #fff;
    :not(:first-child) {
      border: none !important;
    }
    .comment-btn {
      width: 282px;
      height: 46px;
      border: 2px solid #eeeeee;
      font-size: 30px;
      line-height: 46px;
      color: #a7a7a7;
    }
    .van-button {
      height: 40px;
      padding: 0;
    }
    /deep/.van-icon {
      font-size: 40px;
      line-height: 40px;
    }
  }
}
</style>
